Railway brake beam



Sept.. 28, 1937. 1 KADAR RAILWAY BRAKE BEAM Filed Ooi. 14, 1956 sept. 28, 1937 1 2,094,036

tUNITED STATES PATENT OFFICE.

2,094,036 RAILWAY BRAKE BEAM Louis Kadar, Chicago, Ill., assignor to Chicago Railway Equipment Company, Chicago, Ill., a corporation of Illinois Application October 14, 1936, Serial No. 105,497 10 Claims. (Cl. 18S-222) The 'invention relates to railway truss type the inside diameter of the threads on sleeve 1 brake beams in which a tension member is anis greater than the outside diameter of head 5 chore-:d at its ends to the ends of a compression whereby the nut may be applied and removed member, either directly or through an intermeover head 5 to permit application and removal diate brake head or other thrust block structure. of the brake head for initial assembly, repairs 5 It has been customary to form the tension or replacement. Preferably bearing 6 on head 5 member of a round rod and to thread its end has a spherical contour and the corresponding portions and provide nuts thereon seated against end of sleeve 1 is similarly shaped whereby variabearings on the brake heads or ends of the comtions in the angle between the compression mempression member. Beams of this familiar type ber and the tension member are accommodated 10 are subject to breakage of the tension rod adjaand there is an even distribution cf thrust forces cent the anchorage to the compression member, between head 5 and sleeve 1 and between nut 8 and the main object of the present invention and brake head bearing 9. is to eliminate such breakage by avoiding reduc- Obviously the tension rod 4 retains its full section of the cross section of the tension member tional area throughout its length which results 15 at the point of anchorage to the compression in marked increase in service life over the usual member without sacricing the feature which threaded tension rod irrespective of any slight has made the above described type oi beam uniincrease in diameter which may be provided to versally desirable, namely, the capacity for maininsure a tight fit with the sleeve 1 which fit is not :Eil taining the truss structure in a tight condition essential.

by increasing the tension on the rod by tighten- In Figure 4, the exteriorly threaded sleeve I0 ing the nuts. is seated against a pin II extending transversely An additional object of the invention is to through the outer portion of rod I2. Nut I3 secure the desired result without the use of speengages sleeve II) and the bearing on head I4 as cial brake head or other unusual parts which in the previously described structure. Rod I2 25 would conict with parts covered by American is shown with its end portion I5 upset to provide Railway Association standards. increased sectional area at this point and to In. the accompanying drawing which illustrates compensate for the metal removed to accommovarious embodiments of the inventiondate pin II. This arrangement, while preferable,

Figure i is a top view of a typical truss brake is not necessary to provide the rod with increased 80 beam embodying one form of the invention. resistance to the forces tending to break the Figure 2 is a iront elevation of the saine. usual tension rod adjacent to its anchorage to Figure s is an enlarged detail section taken the compression member 0I the beam- Preferapproximately on the line 3-3 of Figure 2. ably sleeve I0 loosely surrounds the tension rod Figures d to 8 are detail sections correspondand can pivot about pin II to accommodate 85 ing to Figure 3 but illustrating respectively difforces tending to vary the angle between tension modications. rod I2 and compression member I6.

In Figures 1, 2 and 3, the compression member In Figure 5, a relatively wide, flat key 22 is L is of channel or U cross section and is camsubstituted for the pin II shown in Figure 4,

le bered from end to end in the usual manner. A otherwise the structures are identical. 40 strut f2 ls seated intermediate the ends of the In Figure 6, the enlargement at the end oi' the compression member and the brake heads 3 are tension member I1 takes the form of the pin I8 seated on the ends of compression member I. corresponding to that shown 4in Figure 4 but the Tension rod 4 passes over strut 2 `and through structure includes a washer I9 intermediate pin braise heads 3 projecting laterally of the latter I8 and sleeve 20, the washer and sleeve having in the usual manner. Rod 4 maintains its opposing convex-concavo bearing faces further smooth periphery throughout its length except facilitating the resulting variations in the angular that the extreme end is upset to provide a head relation between the tension member I1 and having a bearing 6 facing towards the adjacent the compression member 2|.

rake head 3. A sleeve 1 surrounds the end por- In Figure '7, the outer end of threaded sleeve 23 50 tion ci tension member 4 with its outer end is provided with a square or hexagonal head 2l seated against bearing 6. Sleeve 1 is threaded adapted to be engaged by a wrench to provide a exteriorly and a nut 8 may be screwed thereon tightening operation in addition to that ail'orded n until seated against the bearing 9 provided on by nut 25. In this form of the invention the the outer face of the brake head. Preferably extreme end 28 of the tension rod may be upset,

as indicated at 21, to form the bearing for the sleeve.

In Figure 8, the enlargement of the tension rod 2l takes the form of a stud 29 threaded into an opening provided therefor in the end of the tension rod. Sleeve l0 is seated against the inner face of the head of stud 29 and mounts nut 3| as do the sleeves in the previously described forms of the invention.

In each form of the invention the sectional area of the rod is maintained adjacent to the mounting of the brake head on the compression member, there being no reduction in the cross sectional area abreast of the bearings even to the extent resulting from the cutting of threads, although the rod anchorage includes a desirable threaded nut arrangement whereby the beam may be cambered, slack may be taken up, pin holes may be adjusted, and internal tension within the brake head itself may be assured to the same extent as in the usual form of truss type brake beam heretofore in use.'

In some truss type brake beams the compression and tension members are not anchored to the brake head but to a separately formed thrust block upon which the brake head is mounted in such manner as to be free of the truss tension. I consider the thrust blocks of such means as the equivalent of the brake head shown in the accompanying drawing so far as the present invention is concerned. Other variations in details may be made by those skilled in the art without departing from the spirit of the invention and exclusive use of such modifications as come within the scope of the claims is contemplated.

What is claimed is:

1. In a railway truss type brake beam, a compression member, a tension element, a brake head seated on said compression member, a sleeve member surrounding the end portion of said tension element and anchored thereto, and means operatively engaging said sleeve member and said brake head to adiust the truss tension.

2. In a railway truss type brake beam, a compression member, a tension element, a sleeve member surrounding the end portion of said tension element and anchored thereto, and means for tensioning said element seated against one oi said members and movably mounted on the other of said members.

3. In a railway truss type brake beam, a compression member, a tension element, a sleeve member surrounding the end portion of said tension element and anchored thereto, a nut threaded on said sleeve member, and means transmitting the thrust of said nut to said compression member.

4. In a railway truss type brake beam, a compression member, a brake head seated thereon, a tension element passing through said head and having an enlargement near its outer end forming a seat facing towards said brake head, and tensioning means comprising a pair of cooperating parts movable along each other longitudinally of said tension element and engaging said head and seat respectively and arranged to thrust in opposite directions thereon.

5. In a railway truss type brake beam, a compression member, a brake head seated thereon, a tension member extending through said brake head and being provided at its outer ends with a seat facing towards said brake head, a tensioning device engaging said brake head and seat and having a rocking bearing on said seat to accommodate play between said tension member and said compression member.

6. In a railway truss type brake beam, a compression member, a tension member having a smooth periphery for a substantial distance inwardly from its end, a sleeve enclosing the smooth peripheral portion of said tension member-and xedly secured thereto, and means exerting thrust in opposite directions against said sleeve and compression member for tightening the truss structure.

7. In a railway truss type brake beam, a compression member, a brake head seated thereon, a tension member extending through said brake head and having an unthreaded end portion, and a threaded device secured to said end portion of said tension member and operative to tighten up the tension of the beam.

8. In`a railway truss type brake beam, a cornpression member, a brake head seated thereon, a tension member extending through said brake head, an element extending transversely through the end portion of said tension member and projecting laterally therefrom, and a tensioning device seated against said brake head and elementl 9. In a railway truss type brake beam, a compression member, a tension element, a sleeve member loosely surrounding the end portion of said tension element, the outer end of said tension element being provided with a lateral proiection, said sleeve member being pivotally seated on said projection, a nut threaded on the exterior of said sleeve member, and means transmitting the thrust of said nut to said compression member.

10. In a railway truss type brake beam, a compression member, a tension member, a strut between said members, said compression member having a bearing facing away from the end of the beam, the sectional area of said tension member between said strut and bearing being maintained past said bearing, a sleeve enclosing said tension member adjacent said bearing, and means engaging said sleeve and movable relative to said sleeve and tension member and positioned outwardly from said bearing and operative to thrust said sleeve towards said bearing.

LOUIS KADAR. 

